11. The Moon lacks an atmosphere. Of the following statements, which is correct?
(1) Air pressure would still exist since
the Moon has gravity.
(2) Air pressure would still exist since the
Earth's atmosphere extends to the Moon.
(3) Air pressure would not exist on the
Moon.
(4) Air pressure on the Moon equals
the Earth's air pressure.

The purpose of a lab is to do your "expirements" the importance of the topic is so you can now what the story is about and the last one is because no one is me with my question ( what is 3 over 4 x - 9 = 27 maybe you can )

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.